You probably already
know that the Cold War was complicated. One of the problems is that historians
cannot all agree why it started. There are even arguments about when it
started!

Most historians say the Cold War began soon after
the end of World War 2 in 1945. However, relations between the USSR and
Britain and the USA were often strained before that date. This Gallery
and the next one look at this issue.

We have 3 case studies of incidents in this
period which will help you to develop your own views on the Big Question.
Look at the Big Question section to see exact details of what you have
to do. When you are clear in your own mind, click on the case studies
to begin your investigation.